<template>
  <div class="container">
    <div class="main">
      <div class="pay-title">
        支付总金额 <span class="pay-price">￥ {{ order.price }}</span>
      </div>
      <div class="pay-main">
        <h4>微信支付</h4>
        <el-row
          type="flex"
          justify="space-between"
          align="middle"
          class="pay-qrcode"
        >
          <div class="qrcode">
            <!-- 二维码 -->
            <canvas ref="stage"></canvas>
            <p>请使用微信扫一扫</p>
            <p>扫描二维码支付</p>
          </div>
          <div class="pay-example">
            <img src="http://157.122.54.189:9093/images/wx-sweep2.jpg" alt="" />
          </div>
        </el-row>
      </div>
    </div>
  </div>
</template>

<script>
import QRCode from "qrcode";
export default {
  data() {
    return {
      order: {}, //  订单数据
      timer: null, //  定时器
    };
  },
  destroyed() {
    // 这跟 created / mounted 一样都是一个生命周期
    // 在销毁组件的时候触发,
    // 可以讲不能带到别的页面的东西在这里一并销毁即可
    // 这时候页面跳出, 需要清理定时器
    // 避免轮询无法停止
    console.log("跳出页面, 定时器被清理了");
    clearTimeout(this.timer);
  },
  watch: {
    // 使用字符串 监听token 的变化 一但刷新页面就监听 有没有token
    "$store.state.userstore.userinfo.token": {
      handler() {
        // 需要判断有没有token 如果有token 在发送请求
        if (this.$store.state.userstore.userinfo.token) {
          this.$axios({
            url: "/airorders/" + this.$route.query.id,
            headers: {
              Authorization:
                "Bearer " + this.$store.state.userstore.userinfo.token,
            },
          }).then((res) => {
            this.order = res.data;
            // console.log(this.order);
            QRCode.toCanvas(this.$refs.stage, this.order.payInfo.code_url, {
              color: {
                dark: "#0F0",
                light: "#00a",
              },
            });

            // 在这里一但生成二维码就查询付款状态发起请求
            this.payment();
          });
        }
      },
      immediate: true,
    },
  },
  methods: {
    payment() {
      this.$axios({
        method: "post",
        url: "/airorders/checkpay",
        data: {
          id: this.order.id,
          nonce_str: this.order.price,
          out_trade_no: this.order.orderNo,
        },
        headers: {
          Authorization: "Bearer " + this.$store.state.userstore.userinfo.token,
        },
      }).then((res) => {
        const { data } = res;
        if (data.trade_state === "SUCCESS") {
          this.$message.success(data.statusTxt);
        } else {
          // 设置一个定时器 没两秒钟发一次请求
          this.timer = setTimeout(() => {
            // 调用请求二维码查询状态
            console.log("请支付");
            this.payment();
          }, 2000);
        }
      });
    },
  },
};
</script>

<style scoped lang="less">
.container {
  background: #f5f5f5;
  padding: 30px 0;

  .main {
    width: 1000px;
    margin: 0 auto;

    .pay-title {
      text-align: right;
      span {
        font-size: 28px;
        color: orangered;
      }
    }

    .pay-main {
      background: #fff;
      margin-top: 10px;
      border-top: 5px orange solid;
      padding: 30px;

      h4 {
        font-size: 28px;
        font-weight: normal;
        margin-bottom: 10px;
      }

      .pay-qrcode {
        padding: 0 80px;
      }

      .qrcode {
        border: 1px #ddd solid;
        padding: 15px;
        height: fit-content;

        #qrcode-stage {
          width: 200px;
          height: 200px;
          margin-bottom: 10px;
        }

        p {
          line-height: 2;
          text-align: center;
        }
      }
    }
  }
}
</style>